Rotary brush



June 28, 1938. F. w. SCHNELL 2,122,326

ROTARY BRUSH Filed June 7, 1957 2 Sfieets-Sheet 2 Inventor Patented June 28, 1938 UiTD STATES ATENT OFFl 2 Claims.

My invention relates to improvements in rotary brushes for cleaning and polishing purposes, and the primary object thereof is to provide a simply constructed, light and inexpensive device 5 of this character adapted to be expeditiously handled, effective in operation, and having a minimum number of parts readily and inexpensively replaced, when desired.

To the accomplishment of the above, and other objects presently appearing, a preferred embodiment of my invention has been illustrated in the accompanying drawings, set forth in detail in the following description, and defined in the claims appended hereto.

In said drawings:

Figure 1 is a view partly in front elevation and partly in vertical transverse section of a rotary brush embodying my improvements.

Figure 2 is a view in top plan.

Figure 3 is a view in perspective of the brush operating connection.

Referring to the drawings by numerals, in the illustrated embodiment thereof, my improved brush comprises a suitable motor, designated as a unit by the numeral l, the casing 2 of which is provided on top thereof with a suitable bail-like handle 3 for transporting the device and on the bottom thereof with a lateral circular flange i forming a continuation of the lower end 5 of said casing l On the under side of the flange 4, and end 5, is a circular plate 6 secured to the flange l, as by screw bolts l, and having depending therefrom axially of the same and of the armature shaft of the motor l, a sleeve 9. Preferably the plate 6 has a central raised portion l countersunk in the lower end of the casing 2 for centering said plate relative to said casing before the screws l are inserted. The armature shaft 8 of the motor extends below the casing end 5 into said sleeve 9 to provide an additional bearing for said shaft and is bored axially, as at H, for a purpose presently seen. Extending from the armature shaft 8 through and beyond the lower end of the sleeve 9 is an arbor l2 forming part of a brush operating connection, the other element of which is a disk-like, preferably metal, brush carrier I3 clamped to the lower end of said arbor l2, concentrically thereof, by a -pair of clamping nuts it, threaded onto said arbor and between which said carrier is interposed. The arbor I2 is secured at itsupper end in the bore H by a pin l5 passing through said end and through the armature shaft 8, and said arbor extends through a bearing bushing 16 secured in the lower end of the sleeve 9.

Secured to the under side of the brushcarrier l3, concentrically thereof, is a ciroular'brush assembly I! comprising an annular bristle holder iii, of any suitable material, for an annular bristle assembly I9, and a circular backing plate 20, 5 preferably of metal.

The brush assembly I! is secured to the carrier l3 by means of screw bolts 2| passing upwardly through the inner edge of the backing plate 20 into the carrier I3. An axial aperture 22 in said 10 backing plate 20 provides a clearance for the outer end of the arbor l2 and the nut M thereof.

Intermediate the brush assembly IT and the plate 6, and concentric thereto, is a circular dust guard 23, preferably of metal, and comprising a 15 flat top 24 and a depending outwardly flaring edge flange 25. The flange 25 extends into the plane of the backing plate 20 and is of greater diameter than said plate for the passage of dust around said plate upwardly into said guard. The 20 guard 23 is provided with a central aperture 26 fitting over the lower end of the sleeve 9 to which said guide is clamped by a pair of nuts El, threaded on to said sleeve upon opposite sides of the top 24 of said guard. The guard 23 is secured, 25 adjacent its edge, to the before-mentioned plate 6 and flange 4 by means of bolts 23 threaded into said plate and flange and extended through the top plate 2d of the guard, nuts Zil being threaded onto the bolts 28 upon opposite sides 30 of said top plate.

Extending radially from the sleeve 9, above the guard 23 and well beyond the brush assembly I1, is a bail-like hand grip member 30, of any suitable material, threaded onto or otherwise fixed on said sleeve. A strap 3! having its ends suitably secured to the opposite ends of said hand grip 30, respectively, to extend over the top thereof, provides for securing the hand on the hand grip. The strap 3! is buckled together, as at 32, for adjustment over the hand as desired.

The usual leads 33 and St for connection to the house circuit, or the like, are clamped alongside the casing 2 by suitable clips 35 and extended into a plug receptacle 36 suitably secured to the base part of said casing 2. A suitable switch box 3i is secured, as at 38, to the hand grip member 30 adjacent one edge of the latter to be within convenient reach of a finger of the hand gripping said hand grip member. Leads represented at 39, extend from the switch box 3'! to the receptacle 36 for a purpose which will be understood without explanation.

The operation of my invention will, it is believed, be clear from the foregoing description thereof. The machine may be transported from place to place by means of the handle 3 and manipulated over the floor or other surface to be cleaned or polished by means of either the hand grip member 30 or both said member and the handle 3, the latter being used for exerting downward pressure as desired. At any time in the manipulation thereof, the motor may be started .and stopped by means of the switch represented at 31, which is always within convenient reach of a finger of the hand grasping the hand grip member 30. A particular advantage of the strap 3| is that it prevents the hand from slipping ofi the hand grip member 30 and vibration of the hand on said member.

Manifestly the invention as described is susceptible of modifications without departing from the inventive concept and the right is herein reserved to all such modifications falling within the scope of the claims appended hereto.

What I claim is:

1. In a rotary floor brush, the combination with a motor including a casing, and an armature shaft, of a plate secured to one end of the casing and having a sleeve extending therefrom axially of said shaft, a bearing in the outer end of the sleeve, an arbor in the sleeve secured at one end to said shaft and having its opposite end journalled in and extending through said bearing, a rotary brush assembly detachably secured on the extending end of said arbor for rotation therewith, a circular dust guard of inverted panlike form detachably secured to the outer end of the sleeve, and tie bolts extending between said plate and dust guard adjacent the edges thereof to brace the guard against tilting.

2. In a rotary brush, the combination with a motor including a casing, and an armature shaft, said casing being provided with a sleeve extending therefrom axially of said shaft, an arbor in said sleeve connected at one end to the shaft and having its opposite end extending out of the free end of the sleeve, a rotary brush assembly secured on the extending end of the arbor, a bar-like hand grip member extending radially from the sleeve for guiding the brush with one hand, and a handle secured to the other end of the casing for applying pressure to the brush with the other hand.

FRED W. SCI-INELL. 

